i know a electronic device that have clock in mhz and incremented slow.

see this example:

0-10 seconds 15MHZ 500 numbers+ in increment

What is yours opinion of a cpu that with 1000hz can execute 2000 x86 ASM instructions per second on real life, and what is your opinion of a cpu with

5ghz that can make 10 billion x86 ASM instructions per second but fictional